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Polyurethane U-Seal, 5.00 Inch OD, 4.50 Inch ID, 0.38 Inch Height

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Description & Features

Manufactured from polyurethane, this U-Seal from Hercules Sealing Products is designed for hydraulic reciprocating rod and piston applications requiring reliable sealing across a wide operating range. The beveled lip design provides effective film breaking at the sealing interface, helping maintain consistent performance under dynamic conditions.

The Polyurethane U-Seal, 5.00 Inch OD, 4.50 Inch ID, 0.38 Inch Height is rated for pressures from 0 to 6,000 PSI and handles temperatures from -65°F to 220°F, making it well suited for demanding industrial hydraulic environments. With an OD of 5.00 in, an ID of 4.50 in, and a height of 0.375 in, this seal falls into the deep-type profile category where height exceeds the cross section of 0.25 in.

SKU: U25-4.50-37B

Supplier Part Number (MPN): U25-4.50-37B

Alternate Part Numbers: C1DP61, MI-01198305, MINO-00407X60378

Specifications

Cross Section
0.25 in
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
H
0.375 in
I.D.
4.5 in
O.D.
5 in
Supplier Part Number
U25-4.50-37B
Alternate Part Numbers
Alternate Part Number C1DP61, Alternate Part Number MI-01198305, Alternate Part Number MINO-00407X60378
Product Weight
0.06 lbs

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3.25 in

0.1875 in

Polyurethane U-Seal, 3.38 Inch OD, 3.00 Inch ID, 0.19 Inch Height

U18-3.00 Polyurethane U-Seal

0.1875 in

3 in

3.375 in

0.1875 in

Polyurethane U-Seal, 3.38 Inch OD, 3.00 Inch ID, 0.38 Inch Height

U18-3.00-37B Polyurethane U-Seal

0.1875 in

3 in

3.375 in

0.375 in

Polyurethane U-Seal, 3.50 Inch OD, 3.13 Inch ID, 0.38 Inch Height

U18-3.12-37B Polyurethane U-Seal

0.1875 in

3.125 in

3.5 in

0.375 in

Polyurethane U-Seal, 3.50 Inch OD, 3.13 Inch ID, 0.19 Inch Height

U18-3.12-SQB Polyurethane U-Seal

0.1875 in

3.125 in

3.5 in

0.1875 in

Polyurethane U-Seal, 3.88 Inch OD, 3.50 Inch ID, 0.38 Inch Height

U18-3.50-37B Polyurethane U-Seal

0.1875 in

3.5 in

3.875 in

0.375 in

Polyurethane U-Seal, 4.00 Inch OD, 3.63 Inch ID, 0.38 Inch Height

U18-3.62-37B Polyurethane U-Seal

0.1875 in

3.625 in

4 in

0.375 in

Polyurethane U-Seal, 4.00 Inch OD, 3.63 Inch ID, 0.19 Inch Height

U18-3.62-SQB Polyurethane U-Seal

0.1875 in

3.625 in

4 in

0.1875 in

Polyurethane U-Seal, 4.38 Inch OD, 4.00 Inch ID, 0.38 Inch Height

U18-4.00-37B Polyurethane U-Seal

0.1875 in

4 in

4.375 in

0.375 in

Polyurethane U-Seal, 1.25 Inch OD, 0.75 Inch ID, 0.25 Inch Height

U25-0.75 Polyurethane U-Seal

0.25 in

0.75 in

1.25 in

0.25 in

Polyurethane U-Seal, 1.44 Inch OD, 0.81 Inch ID, 0.25 Inch Height

U25-0.93 Polyurethane U-Seal

0.25 in

0.8125 in

1.438 in

0.25 in

Polyurethane U-Seal, 1.50 Inch OD, 1.00 Inch ID, 0.38 Inch Height

U25-1.00-37B Polyurethane U-Seal

0.25 in

1 in

1.5 in

0.375 in

Polyurethane U-Seal, 1.50 Inch OD, 1.00 Inch ID, 0.25 Inch Height

U25-1.00-SQB Polyurethane U-Seal

0.25 in

1 in

1.5 in

0.25 in

Polyurethane U-Seal, 1.63 Inch OD, 1.06 Inch ID, 0.25 Inch Height

U25-1.12 Polyurethane U-Seal

0.25 in

1.0625 in

1.625 in

0.25 in

Polyurethane U-Seal, 1.63 Inch OD, 1.06 Inch ID, 0.38 Inch Height

U25-1.12-37B Polyurethane U-Seal

0.25 in

1.0625 in

1.625 in

0.375 in

Polyurethane U-Seal, 1.69 Inch OD, 0.19 Inch ID, 0.25 Inch Height

U25-1.18 Polyurethane U-Seal

0.25 in

0.188 in

1.688 in

0.25 in

Polyurethane U-Seal, 1.75 Inch OD, 1.25 Inch ID, 0.25 Inch Height

U25-1.25-SQB Polyurethane U-Seal

0.25 in

1.25 in

1.75 in

0.25 in

Polyurethane U-Seal, 1.88 Inch OD, 1.38 Inch ID, 0.25 Inch Height

U25-1.37 Polyurethane U-Seal

0.25 in

1.375 in

1.875 in

0.25 in

Polyurethane U-Seal, 1.88 Inch OD, 1.38 Inch ID, 0.38 Inch Height

U25-1.37-37B Polyurethane U-Seal

0.25 in

1.375 in

1.875 in

0.375 in

Polyurethane U-Seal, 2.00 Inch OD, 1.50 Inch ID, 0.31 Inch Height

U25-1.50-31B Polyurethane U-Seal

0.25 in

1.5 in

2 in

0.3125 in

Polyurethane U-Seal, 2.00 Inch OD, 1.50 Inch ID, 0.25 Inch Height

U25-1.50-SQB Polyurethane U-Seal

0.25 in

1.5 in

2 in

0.25 in

Polyurethane U-Seal, 2.25 Inch OD, 1.75 Inch ID, 0.25 Inch Height

U25-1.75 Polyurethane U-Seal

0.25 in

1.75 in

2.25 in

0.25 in

Polyurethane U-Seal, 2.25 Inch OD, 1.75 Inch ID, 0.38 Inch Height

U25-1.75-37B Polyurethane U-Seal

0.25 in

1.75 in

2.25 in

0.375 in

Polyurethane U-Seal, 2.38 Inch OD, 1.88 Inch ID, 0.38 Inch Height

U25-1.87-37B Polyurethane U-Seal

0.25 in

1.875 in

2.375 in

0.375 in

Polyurethane U-Seal, 2.50 Inch OD, 2.00 Inch ID, 0.31 Inch Height

U25-2.00-31B Polyurethane U-Seal

0.25 in

2 in

2.5 in

0.3125 in

Polyurethane U-Seal, 2.50 Inch OD, 2.00 Inch ID, 0.25 Inch Height

U25-2.00-SQB Polyurethane U-Seal

0.25 in

2 in

2.5 in

0.25 in

Polyurethane U-Seal, 2.63 Inch OD, 2.13 Inch ID, 0.38 Inch Height

U25-2.12-37B Polyurethane U-Seal

0.25 in

2.125 in

2.625 in

0.375 in

Polyurethane U-Seal, 2.75 Inch OD, 2.25 Inch ID, 0.25 Inch Height

U25-2.25 Polyurethane U-Seal

0.25 in

2.25 in

2.75 in

0.25 in

Polyurethane U-Seal, 2.75 Inch OD, 2.25 Inch ID, 0.38 Inch Height

U25-2.25-37B Polyurethane U-Seal

0.25 in

2.25 in

2.75 in

0.375 in

Polyurethane U-Seal, 2.88 Inch OD, 2.38 Inch ID, 0.38 Inch Height

U25-2.37-37B Polyurethane U-Seal

0.25 in

2.375 in

2.875 in

0.375 in

Polyurethane U-Seal, 3.00 Inch OD, 2.50 Inch ID, 0.25 Inch Height

U25-2.50-SQB Polyurethane U-Seal

0.25 in

2.5 in

3 in

0.25 in

Polyurethane U-Seal, 3.13 Inch OD, 2.63 Inch ID, 0.38 Inch Height

U25-2.62-37B Polyurethane U-Seal

0.25 in

2.625 in

3.125 in

0.375 in

Polyurethane U-Seal, 3.25 Inch OD, 2.75 Inch ID, 0.38 Inch Height

U25-2.75-37B Polyurethane U-Seal

0.25 in

2.75 in

3.25 in

0.375 in

Polyurethane U-Seal, 3.25 Inch OD, 2.75 Inch ID, 0.25 Inch Height

U25-2.75-SQB Polyurethane U-Seal

0.25 in

2.75 in

3.25 in

0.25 in

Polyurethane U-Seal, 3.75 Inch OD, 3.25 Inch ID, 0.38 Inch Height

U25-3.25-37B Polyurethane U-Seal

0.25 in

3.25 in

3.75 in

0.375 in

Polyurethane U-Seal, 4.00 Inch OD, 3.50 Inch ID, 0.25 Inch Height

U25-3.50 Polyurethane U-Seal

0.25 in

3.5 in

4 in

0.25 in

Polyurethane U-Seal, 4.00 Inch OD, 3.50 Inch ID, 0.25 Inch Height

U25-3.50-SQB Polyurethane U-Seal

0.25 in

3.5 in

4 in

0.25 in

Polyurethane U-Seal, 4.25 Inch OD, 3.75 Inch ID, 0.38 Inch Height

U25-3.75-37B Polyurethane U-Seal

0.25 in

3.75 in

4.25 in

0.375 in

Polyurethane U-Seal, 4.25 Inch OD, 3.75 Inch ID, 0.25 Inch Height

U25-3.75-SQB Polyurethane U-Seal

0.25 in

3.75 in

4.25 in

0.25 in

Polyurethane U-Seal, 4.50 Inch OD, 4.00 Inch ID, 0.38 Inch Height

U25-4.00-37B Polyurethane U-Seal

0.25 in

4 in

4.5 in

0.375 in

Polyurethane U-Seal, 4.50 Inch OD, 4.00 Inch ID, 0.50 Inch Height

U25-4.00-50D Polyurethane U-Seal

0.25 in

4 in

4.5 in

0.5 in

Polyurethane U-Seal, 4.50 Inch OD, 4.00 Inch ID, 0.56 Inch Height

U25-4.00-56B Polyurethane U-Seal

0.25 in

4 in

4.5 in

0.5625 in

Polyurethane U-Seal, 5.00 Inch OD, 4.50 Inch ID, 0.38 Inch Height

U25-4.50-37B Polyurethane U-Seal

0.25 in

4.5 in

5 in

0.375 in

Polyurethane U-Seal, 5.00 Inch OD, 4.50 Inch ID, 0.56 Inch Height

U25-4.50-56B Polyurethane U-Seal

0.25 in

4.5 in

5 in

0.5625 in

Polyurethane U-Seal, 5.00 Inch OD, 4.50 Inch ID, 0.63 Inch Height

U25-4.50-62B Polyurethane U-Seal

0.25 in

4.5 in

5 in

0.625 in

Polyurethane U-Seal, 5.50 Inch OD, 5.00 Inch ID, 0.38 Inch Height

U25-5.00-37B Polyurethane U-Seal

0.25 in

5 in

5.5 in

0.375 in

Polyurethane U-Seal, 6.00 Inch OD, 5.50 Inch ID, 0.25 Inch Height

U25-5.50 Polyurethane U-Seal

0.25 in

5.5 in

6 in

0.25 in

Polyurethane U-Seal, 6.00 Inch OD, 5.50 Inch ID, 0.38 Inch Height

U25-5.50-37B Polyurethane U-Seal

0.25 in

5.5 in

6 in

0.375 in

Polyurethane U-Seal, 6.00 Inch OD, 5.50 Inch ID, 0.56 Inch Height

U25-5.50-56B Polyurethane U-Seal

0.25 in

5.5 in

6 in

0.5625 in

Polyurethane U-Seal, 1.63 Inch OD, 1.00 Inch ID, 0.50 Inch Height

U31-1.00-50B Polyurethane U-Seal

0.3125 in

1 in

1.625 in

0.5 in

Polyurethane U-Seal, 1.88 Inch OD, 1.25 Inch ID, 0.31 Inch Height

U31-1.25 Polyurethane U-Seal

0.3125 in

1.25 in

1.875 in

0.3125 in

Polyurethane U-Seal, 1.88 Inch OD, 1.25 Inch ID, 0.38 Inch Height

U31-1.25-37B Polyurethane U-Seal

0.3125 in

1.25 in

1.875 in

0.375 in

Polyurethane U-Seal, 2.00 Inch OD, 1.38 Inch ID, 0.38 Inch Height

U31-1.37-37B Polyurethane U-Seal

0.3125 in

1.375 in

2 in

0.375 in

Polyurethane U-Seal, 2.00 Inch OD, 1.38 Inch ID, 0.31 Inch Height

U31-1.37-SQB Polyurethane U-Seal

0.3125 in

1.375 in

2 in

0.3125 in

Polyurethane U-Seal, 2.13 Inch OD, 1.50 Inch ID, 0.31 Inch Height

U31-1.50 Polyurethane U-Seal

0.3125 in

1.5 in

2.125 in

0.3125 in

Polyurethane U-Seal, 2.38 Inch OD, 1.75 Inch ID, 0.38 Inch Height

U31-1.75-37B Polyurethane U-Seal

0.3125 in

1.75 in

2.375 in

0.375 in

Polyurethane U-Seal, 2.50 Inch OD, 1.88 Inch ID, 0.31 Inch Height

U31-1.87 Polyurethane U-Seal

0.3125 in

1.875 in

2.5 in

0.3125 in

Polyurethane U-Seal, 2.63 Inch OD, 2.00 Inch ID, 0.31 Inch Height

U31-2.00 Polyurethane U-Seal

0.3125 in

2 in

2.625 in

0.3125 in

Polyurethane U-Seal, 2.63 Inch OD, 2.00 Inch ID, 0.50 Inch Height

U31-2.00-50B Polyurethane U-Seal

0.3125 in

2 in

2.625 in

0.5 in

Polyurethane U-Seal, 2.88 Inch OD, 2.25 Inch ID, 0.50 Inch Height

U31-2.25-50B Polyurethane U-Seal

0.3125 in

2.25 in

2.875 in

0.5 in

Polyurethane U-Seal, 3.00 Inch OD, 2.38 Inch ID, 0.31 Inch Height

U31-2.37 Polyurethane U-Seal

0.3125 in

2.375 in

3 in

0.3125 in

Polyurethane U-Seal, 3.13 Inch OD, 2.50 Inch ID, 0.31 Inch Height

U31-2.50 Polyurethane U-Seal

0.3125 in

2.5 in

3.125 in

0.3125 in

Polyurethane U-Seal, 3.13 Inch OD, 2.50 Inch ID, 0.50 Inch Height

U31-2.50-50B Polyurethane U-Seal

0.3125 in

2.5 in

3.125 in

0.5 in

Polyurethane U-Seal, 3.38 Inch OD, 2.75 Inch ID, 0.31 Inch Height

U31-2.75 Polyurethane U-Seal

0.3125 in

2.75 in

3.375 in

0.3125 in

Polyurethane U-Seal, 3.38 Inch OD, 2.75 Inch ID, 0.50 Inch Height

U31-2.75-50B Polyurethane U-Seal

0.3125 in

2.75 in

3.375 in

0.5 in

Polyurethane U-Seal, 3.50 Inch OD, 2.88 Inch ID, 0.31 Inch Height

U31-2.87 Polyurethane U-Seal

0.3125 in

2.875 in

3.5 in

0.3125 in

Polyurethane U-Seal, 3.63 Inch OD, 3.00 Inch ID, 0.50 Inch Height

U31-3.00-50B Polyurethane U-Seal

0.3125 in

3 in

3.625 in

0.5 in

Polyurethane U-Seal, 4.00 Inch OD, 3.38 Inch ID, 0.50 Inch Height

U31-3.37-50B Polyurethane U-Seal

0.3125 in

3.375 in

4 in

0.5 in

Polyurethane U-Seal, 4.63 Inch OD, 4.00 Inch ID, 0.31 Inch Height

U31-4.00 Polyurethane U-Seal

0.3125 in

4 in

4.625 in

0.3125 in

Polyurethane U-Seal, 4.63 Inch OD, 4.00 Inch ID, 0.56 Inch Height

U31-4.00-56B Polyurethane U-Seal

0.3125 in

4 in

4.625 in

0.5625 in

Polyurethane U-Seal, 5.00 Inch OD, 4.38 Inch ID, 0.31 Inch Height

U31-4.37 Polyurethane U-Seal

0.3125 in

4.375 in

5 in

0.3125 in

Polyurethane U-Seal, 5.13 Inch OD, 4.50 Inch ID, 0.31 Inch Height

U31-4.50 Polyurethane U-Seal

0.3125 in

4.5 in

5.125 in

0.3125 in

Polyurethane U-Seal, 2.00 Inch OD, 1.25 Inch ID, 0.38 Inch Height

U37-1.25 Polyurethane U-Seal

0.375 in

1.25 in

2 in

0.375 in

Polyurethane U-Seal, 2.50 Inch OD, 1.75 Inch ID, 0.38 Inch Height

U37-1.75 Polyurethane U-Seal

0.375 in

1.75 in

2.5 in

0.375 in

Polyurethane U-Seal, 3.25 Inch OD, 2.50 Inch ID, 0.50 Inch Height

U37-2.50-50B Polyurethane U-Seal

0.375 in

2.5 in

3.25 in

0.5 in

Polyurethane U-Seal, 3.50 Inch OD, 2.75 Inch ID, 0.38 Inch Height

U37-2.75 Polyurethane U-Seal

0.375 in

2.75 in

3.5 in

0.375 in

Polyurethane U-Seal, 4.00 Inch OD, 3.25 Inch ID, 0.50 Inch Height

U37-3.25-50B Polyurethane U-Seal

0.375 in

3.25 in

4 in

0.5 in

Polyurethane U-Seal, 4.25 Inch OD, 3.50 Inch ID, 0.38 Inch Height

U37-3.50 Polyurethane U-Seal

0.375 in

3.5 in

4.25 in

0.375 in

Polyurethane U-Seal, 4.50 Inch OD, 3.75 Inch ID, 0.50 Inch Height

U37-3.75-50D Polyurethane U-Seal

0.375 in

3.75 in

4.5 in

0.5 in

Polyurethane U-Seal, 4.75 Inch OD, 4.00 Inch ID, 0.63 Inch Height

U37-4.00-62B Polyurethane U-Seal

0.375 in

4 in

4.75 in

0.625 in

Polyurethane U-Seal, 5.00 Inch OD, 4.25 Inch ID, 0.50 Inch Height

U37-4.25-50D Polyurethane U-Seal

0.375 in

4.25 in

5 in

0.5 in

Polyurethane U-Seal, 5.00 Inch OD, 4.25 Inch ID, 0.63 Inch Height

U37-4.25-62B Polyurethane U-Seal

0.375 in

4.25 in

5 in

0.625 in

Polyurethane U-Seal, 5.00 Inch OD, 4.25 Inch ID, 0.38 Inch Height

U37-4.25-SQB Polyurethane U-Seal

0.375 in

4.25 in

5 in

0.375 in

Polyurethane U-Seal, 5.25 Inch OD, 4.50 Inch ID, 0.63 Inch Height

U37-4.50-62B Polyurethane U-Seal

0.375 in

4.5 in

5.25 in

0.625 in

Polyurethane U-Seal, 5.75 Inch OD, 5.00 Inch ID, 0.63 Inch Height

U37-5.00-62B Polyurethane U-Seal

0.375 in

5 in

5.75 in

0.625 in

Polyurethane U-Seal, 6.00 Inch OD, 5.25 Inch ID, 0.38 Inch Height

U37-5.25 Polyurethane U-Seal

0.375 in

5.25 in

6 in

0.375 in

Polyurethane U-Seal, 6.00 Inch OD, 5.25 Inch ID, 0.50 Inch Height

U37-5.25-50D Polyurethane U-Seal

0.375 in

5.25 in

6 in

0.5 in

Polyurethane U-Seal, 7.00 Inch OD, 6.25 Inch ID, 0.50 Inch Height

U37-6.25-50D Polyurethane U-Seal

0.375 in

6.25 in

7 in

0.5 in

Polyurethane U-Seal, 3.00 Inch OD, 2.00 Inch ID, 0.50 Inch Height

U50-2.00-SQB Polyurethane U-Seal

0.5 in

2 in

3 in

0.5 in

Polyurethane U-Seal, 3.50 Inch OD, 2.50 Inch ID, 0.50 Inch Height

U50-2.50 Polyurethane U-Seal

0.5 in

2.5 in

3.5 in

0.5 in

Product Questions & Answers (3)

Question by: Billy B on Feb 8, 2026, 6:45 AM
Got a hydraulic cylinder with a 4.50 inch rod and a 5.00 inch bore housing, this seal gonna drop right in, or is there more to fittin' it than just the numbers matchin up?
Answer by: Customer Support on Feb 9, 2026, 6:02 PM
For a rod seal application, the 4.50 inch ID seats against the rod and the 5.00 inch OD seats into the housing bore, so if your hardware matches those dimensions you're in good shape on fit. The height on this one is 0.375 inches, which puts it in the deep-type profile category since that height clears the 0.25 inch cross section. Just make sure your gland depth accommodates that 0.375 inch height before you go pressing it in.
Question by: Jean A on Jul 31, 2025, 6:30 PM
got a cylinder that takes a 4.50 id by 5.00 od seal, is this the right size or am i missing something
Answer by: Customer Support on Aug 2, 2025, 1:32 PM
Fit comes down to those three dimensions. This U-seal is 4.50 inch ID, 5.00 inch OD, and 0.375 inch tall, with a 0.25 inch cross section. It is also a deep-type profile since the height is greater than the cross section.
Question by: Larry E on Jul 24, 2025, 1:58 PM
What pressure range can this handle?
Answer by: Customer Support on Jul 26, 2025, 8:12 AM
It's rated to handle pressures from 0 up to 6,000 PSI, so it should work in a pretty wide range of hydraulic applications.